http://www.benchmarkmedia.com/micpre/mp3/default.asp
This is the Benchmark Media MP-3 mic preamp module mounted on an XLR jack.
Benchmark stuff is REALLY nice and sounds great. Will work on a bipolar
15Vdc supply. Just add a panel and you're all set!
For the really tweaky people out there step up to the MP-4:
http://www.benchmarkmedia.com/micpre/mp4/default.asp
Ivan